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1. 发明专利

JPH10249147A METHOD OF REMOVING ASH STUCK TO DESULFURIZING FAN MOVING BLADE 失效
公开(公告)号：JPH10249147A
公开(公告)日：1998-09-22
申请号：JP6073097
申请日：1997-03-14
申请人： MITSUBISHI HEAVY IND LTD
发明人： TSUKIMOTO TADASHI , TSUKAHARA CHISATO
IPC分类号： B01D53/34 , B01D53/50 , B01D53/77
摘要： PROBLEM TO BE SOLVED: To provide a method of removing ash stuck to a desulfurizing fan moving blade in which the moving blade is not damaged and working efficiency and working environment are good. SOLUTION: By successively performing treatments of the following processes (1)-(4), the ash stuck to the moving blade is removed: (1) a process in which the moving blade to which ash is stuck is immersed in water solution of hydrochloric acid, (2) a process in which the moving blade that has been treated with the water solution of hydrochloric acid is immersed in water solution of hydrofluoric acid, (3) a process in which the moving blade that has been treated with the water solution of hydrofluoric acid is immersed in water, (3) a process in which the moving blade that has been treated with water solution of hydrofluoric acid is immersed in water to wash acid, and (4) a process in which the moving blade after washing is immersed in slurry of calcium carbonate or magnesium hydroxide thereafter drying it to form an alkaline coating film on the surface thereof.

2. 发明专利

JPH1047300A AXIAL FLOW FAN FOR EXHAUST GAS DESULFURIZER 失效
公开(公告)号：JPH1047300A
公开(公告)日：1998-02-17
申请号：JP20948896
申请日：1996-08-08
申请人： MITSUBISHI HEAVY IND LTD
发明人： MATSUKI SHIGEYUKI , TSUKIMOTO TADASHI , FUKUDA MASAKATSU , SHIBATA AKIO , MIHARA MITSUO , KUSUMOTO YOSHIYUKI
IPC分类号： F04D29/38 , B01D53/50 , B01D53/77
摘要： PROBLEM TO BE SOLVED: To prevent separation of a coating material in a severe corrosive environment, and obtain excellent durability by covering a part or the whole of a metallic moving blade surface of an axial flow fan with a vinyl ester resin layer containing at least a glass cloth layer of a single layer. SOLUTION: In the case of manufacturing an axial flow fan to be applied to an exhaust gas desulfurizer having a severe corrosive environment, a vinyl ester resin primer 2 to improve adhesion is applied to a Ni alloy base material 1, and afterwards, it is coated with a flake-containing vinyl ester resin 3. Next, glass cloth 4 impregnated with the vinyl ester resin is stuck on it, and its upper surface is also coated with the flake-containing vinyl ester resin 3, and is coated with a vinyl ester resin abrasion resistant top coat 5 as a coating finish. Therefore, separation of a metallic surface and a coating material by impact with mist at high speed rotating time is prevented, and durability endurable to long- term use is obtained.

3. 发明专利

JPH09194973A SULFURIC ACID CORROSION RESISTANT MATERIAL 失效
公开(公告)号：JPH09194973A
公开(公告)日：1997-07-29
申请号：JP1822296
申请日：1996-01-10
申请人： MITSUBISHI HEAVY IND LTD
发明人： HIROMATSU KAZUO , SAITO MASAHIRO , NISHIO TOSHIAKI , TSUKIMOTO TADASHI
IPC分类号： C22C19/05
摘要： PROBLEM TO BE SOLVED: To provide a corrosion resistant material for a desulfurizing fan particularly used in a wet exhaust gas desulfurizer, as for a sulfuric acid corrosion resistant material, by using specified materials by the weight % in the specified ranges and executing casting. SOLUTION: A sulfuric acid corrosion resistant material composed of, by weight, 15 to 30% Cr which is the important element mainly composing an oxidized film, 3 to 10% Mo which is the important element for preventing stress corrosion cracking and pitting to chlorides, 1 to 3% Cu which is the important element for preventing pitting caused by sulfuric acid, and the balance Ni which is the important element for forming structurally stable austenite is cast to obtain a corrosion resistant material for a desulfurizing fan suitable as the desulfurizing fan material in a wet exhaust gas desulfurizer excellent in corrosion resistance to sulfuric acid.

4. 发明专利

JPH07305828A PROGRESS PREVENTING METHOD FOR PITTING 失效
公开(公告)号：JPH07305828A
公开(公告)日：1995-11-21
申请号：JP9595794
申请日：1994-05-10
申请人： MITSUBISHI HEAVY IND LTD
发明人： FUKUDA MASAKATSU , TSUKIMOTO TADASHI
IPC分类号： F23J15/00
摘要： PURPOSE:To prevent process of pitting by sealing pitting part generated at a metal material to be used under severe conditions of a corrosion environment with resin dissolved with solvent. CONSTITUTION:A pitting part generated at a metal material to be used under severe conditions of a corrosion environment is sealed with resin dissolved with solvent. The metal material to be used includes, for example, Ni-base alloy, etc., to be used, for example, as the material of the moving blade 4 of a blower. The solvent includes, for example, organic solvent such as thinner, acetone, xylene. The resin includes, for example, vinyl chloride resin, vinyl acetate resin, polyurethane resin, acrylic resin, etc. The sealing is conducted by feeding solution which has low viscosity and in which the resin is dissolved in the solvent to fine pitting parts of the material generated at an initial time. Since the solution has the low viscosity, it is impregnated to the depth of the finely pitting part by the operation of a capillarity to seal the etched part. Thus, progress of the pitting can be prevented.

5. 发明专利

JPH09316607A CAST CORROSION RESISTANT MATERIAL FOR DESULFURIZING FAN 失效
公开(公告)号：JPH09316607A
公开(公告)日：1997-12-09
申请号：JP15051096
申请日：1996-05-23
申请人： MITSUBISHI HEAVY IND LTD
发明人： TAKEDA YASUYUKI , HIROMATSU KAZUO , TSUKIMOTO TADASHI , SAITO MASAHIRO , NISHIO TOSHIAKI
IPC分类号： C22C38/00 , C22C38/22
摘要： PROBLEM TO BE SOLVED: To develop a corrosion resistant material for a sulfurizing fan excellent in resistance to pitting corrosion caused by sulfuric acid by adding and incorporating specified amounts of Cr, Mo and Cu into Fe. SOLUTION: In a boiler or the like using heavy oil, coal, etc., corrosive exhaust gas contg. sulfuric acid is generated by gaseous SO2 and gaseous H2 O generated by the combustion of the above fuel, and as the material for a desulfurizing fan for excluding the above, an Fe-Cr-Mo-Cu alloy is used, and the desulfurizing fan is cast. The cast corrosion resistant material having excellent resistance to pitting corrosion caused by sulfuric acid can be obtd. at a low cost.

6. 发明专利

JPH08215891A SLIDABLE STRAP OF WELDING EQUIPMENT 失效
公开(公告)号：JPH08215891A
公开(公告)日：1996-08-27
申请号：JP2271495
申请日：1995-02-10
申请人： MITSUBISHI HEAVY IND LTD
发明人： TSUKIMOTO TADASHI , INOUE KOBO , IWABUCHI HIROSHI , MATSUMOTO MASARU
IPC分类号： B23K25/00 , B23K37/06
摘要： PURPOSE: To provide a slidable strap of a welding equipment which achieves the uniform and beautiful welding, prevents the breakage of a truck, etc., reduces the working time and reduces the cost by placing the slidable strap on a groove part of an erected member to be welded, and providing a driving source to drive the welding equipment in an approximately synchronizing manner to the moving speed of an automatic truck. CONSTITUTION: A backing 8 consisting of a water-cooled copper plate is arranged on the back side of the groove of a grooved base metal 7 to be welded and a slidable strap 1 is arranged on the face side. The backing 8 is installed over the whole length of the part to be welded, while the slidable strap 1 is elevated as the welding is advanced in an interlocking manner with a separately installed welding truck. The slidable strap 1 is elevated as the welding is advanced while the slidable strap is pressed against the base metal 7 to be welded so as to form a part 10 to be welded by an arm slide jig 12 on the truck side through an arm 9. A motor 2 is driven, and a caterpillar 6 installed on the slidable strap 1 is driven so as to be at the same speed as that of the separately installed truck to elevate the slidable strap 1 at the stable and uniform speed.

7. 发明专利

JPH115015A REFORMING METHOD FOR STICKING ASH 失效
公开(公告)号：JPH115015A
公开(公告)日：1999-01-12
申请号：JP15971097
申请日：1997-06-17
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAO TOSHIO , TSUBAKISAKI SENICHI , MOTAI KENJI , TSUKIMOTO TADASHI
IPC分类号： B08B7/04 , B01D53/50
摘要： PROBLEM TO BE SOLVED: To easily and surely remove a sticking ash by repeatedly blowing an aq. solution containing an acid soluble composition to the surface of a fan every prescribed time in the operation stage and previously forming a layer of the acid soluble composition on the surface of the fan before the operation to reform the sticking ash. SOLUTION: The sticking ash 2 is stuck to the surface of a blade part 4 of a stack gas desulfurization fan, on which the acid soluble composition layer 3 is previously formed, and grown through the operation and the acid soluble composition 1 sprayed at a fixed interval is adequately dispersed in the inside of the sticking ash 2. Thus the sticking ash 2 changes the properties through the whole cross section and on the joined surface to the blade part 4 by containing the acid soluble composition 1 and being joined to the acid soluble composition layer 3. Where, as a structural material of the acid soluble composition 1 dispersed in the sticking ash 2 and the acid soluble composition layer 3 formed on the surface of the blade part 4, zinc, tin, an acid soluble iron oxide, a carbonate (e.g. CaCO3 , MgCO3 ), a metallic hydroxide and the like are used.

8. 发明专利

JPH09256048A METHOD FOR IMPROVING CORROSION RESISTANCE OF STAINLESS CAST STEEL AND HIGH ALLOY STEEL CASTING 失效
公开(公告)号：JPH09256048A
公开(公告)日：1997-09-30
申请号：JP6088196
申请日：1996-03-18
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAITO MASAHIRO , TSUKIMOTO TADASHI
IPC分类号： B01D53/50 , B01D53/77 , C21D8/00
摘要： PROBLEM TO BE SOLVED: To improve the corrosion. resistance of a stainless cast steel and a high alloy steel casting by forming a plastic worked layer on the surface of a casting and thereafter executing heat treatment at a temp. in a specified range. SOLUTION: For removing the defective parts attributed to the cast structure in a stainless cast steel and a high alloy steel casting, i.e., δ ferritic phases and eutectic structures in the surface layer part of a casting product, at first, a plastic worked layer is formed on the surface layer of the casting by a shot blasting method or the like, which is thereafter subjected to heat treatment in the temp. range of 700 to 1200 deg.C to recrystallize the surface layer applied with the plastic working and to form the metallic structure into the one composed of austenite single phases, by which the corrosion resistance of the stainless cast steel and high alloy steel casting can be improved.

9. 发明专利

JPH0931576A HEAT TRANSFER TUBE FOR SULFURIC ACID DEW POINT CORROSION RESISTANCE 失效
公开(公告)号：JPH0931576A
公开(公告)日：1997-02-04
申请号：JP20677995
申请日：1995-07-21
申请人： MITSUBISHI HEAVY IND LTD
发明人： HIROMATSU KAZUO , TAKEDA YASUYUKI , TSUKIMOTO TADASHI , SHINOHARA MASATOMO , NOTOMI HIROSHI , SAITO MASAHIRO , NISHIO TOSHIAKI
IPC分类号： C22C19/05 , F16L58/08
摘要： PROBLEM TO BE SOLVED: To produce a heat transfer tube good in sulfuric acid dew point corrosion resistance by coating it with a self-fluxing alloy contg. specified amounts of Cr, Si, Mo, Cu and Ni. SOLUTION: A heat transfer tube thermally sprayed with an alloy has a compsn. contg., by weight, 15 to 30% Cr, 8 to 10% Si, 3 to 10% Mo and 1 to 3% Cu, and the balance substantial Ni to form sprayed coating. This sprayed coating is heated to form into a self-fluxing alloy. Cr is an important element composing the sprayed coating, and it is needed at least by 15%. In the case of >30%, α phses are formed, and it is made brittle. Si reduces the m.p. of the sprayed coating, and it is effective at the time of executing melting treatment for sealing pores present in the coating. Mo prevents stress corrosion cracking and pitting to chlorides. In the case of >10% content, it is made brittle. Cu prevents sulfuric acid dew point corrosion. In the case of >3% content, intermetallic compounds are formed, and it made brittle. Ni forms stable- austenite.

10. 发明专利

JPH08225910A SULFURIC ACID AND DEW POINT CORROSION RESISTANT HEAT TRANSFER TUBE 失效
公开(公告)号：JPH08225910A
公开(公告)日：1996-09-03
申请号：JP3036895
申请日：1995-02-20
申请人： MITSUBISHI HEAVY IND LTD
发明人： TAKEDA YASUYUKI , HIROMATSU KAZUO , TSUKIMOTO TADASHI , SHINOHARA MASATOMO , NOTOMI HIROSHI , SAITO MASAHIRO , NISHIO TOSHIAKI
IPC分类号： C23C4/08
摘要： PURPOSE: To improve the sulfuric acid corrosion resistance by using a thermal spraying material containing the specific contents of Ni, Cr, Mo, Cu and Fe with a thermal spraying method to form the thermal spray deposit having a specific thickness on the surface of a carbon steel tube. CONSTITUTION: The thermal spray deposit having >=0.2mm is formed on the surface of the carbon steel tube with the thermal spraying material containing by wt% of 18-25 Ni, 15-30 Cr, 3-10 Mo, 0.5-3 Cu and the balance Fe. Cr constitutes the oxide film and is necessary to contain the min. 15%, and in the case of exceeding 30% Cr, δphase, etc., is formed and the product is embrittled. Mo prevents stress corrosion crack and pitting to a chloride, and in the case of containing 10% Mo, the product is embrittled. Cu has the effect to prevent the sulfuric acid corrosion, and in the case of exceeding 3%, intermetallic compound is formed and the product is embrittled. Ni forms the stable austenite, and if this content is much, since the cost is raised, the upper limit is made to be 25%. If the film thickness is thinner than 0.2mm, the uneven part in the thickness is developed and the corrosion resistance is lowered.

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